Process for the production of insulating panels, door panels, furniture board or the like



Aug. 18, 1953 w. PRASE 2,649,135

PROCESS FOR THE PRODUCTION OF INSULATING PANELS, DOOR PANELS. FURNITUREBOARD OR THE LIKE Filed Oct. 28, 1950 Fig. 1

TR? A 2% Fig.2

jwe/vroe. Werner Prase 5y I Mm! -r ATTORNEYS Patented Aug. 18, 1953PROCESS FOR THE PRODUCTION OF INSU- LATING PANELS, DOOR PANELS, FURNI-TUBE BOARD OR THE LIKE Werner Prase, Stuttgart, Germany ApplicationOctober 28, 1950, Serial No. 192,656 In Germany October 29, 1949 7Claims. (01. 15428) This invention concerns a process for the productionof insulating panels, door panels, furniture board and the like of thetype which are filled with sound or heat insulating materials and whichare surfaced on both their wide faces with, for instance, wood veneers,plywood sheets or compressed sheets.

The aim of the invention is to produce such panels in a simple andeconomical manner and to provide them with jointing ledges so that rigidpanels are created which may be treated according to the usualwoodworking process, in which the surfacing material adheressatisfactorily onto the jointing ledges and the filling material, sothat they will not come loose at their inner sides and do not blister.Moreover it is desired to use also as filling materials, glass-wool,slag-wool, stone-wool, peat mould and other inexpensive materials.

According to the present invention a process for the manufacture ofinsulating panels, door panels, furniture board or the like which arefilled with a filling material, are surfaced on their two wide faceswith suitable material characterised in that jointing ledges to form theouter edges of the respective panel or board sides are, before theinsertion of the filling material, laid on the lower panel side orsurfacing, which is provided with a film of glue or the like, theledges, or edge strips, also forming, in combination with key stripsinserted in vertical grooves therein the limiting transverse walls forthe filling material, and that the upper sheets of surfacing material,also provided on their under side with a film of glue, under pressurecause the key strips to enter the grooves completely, the fillingmaterial being also compressed, both surface sheets or panel sides beingglued together at the jointing ledges. The ledges, which correspond tothe thickness of the completely compressed layer of filling material,between the two I panel sides may each be half the finished distancebetween the panel sides, whereby the two sides are completely identicali. e. they both have a trapezoidal cross section with straight outersides and oblique inner sides, their bases resting on the respectivepanel sides and the narrower inner sides being interrupted bylongitudinal slots into each of which the respective ends of a narrowand upright key strip engages. Similarly dowels can be glued on to theinner sides of the ledges as will be explained hereinafter.

The invention will be described further with reference to theaccompanying drawings in which:

,ends of the dowels l4.

Figs. 1 and 2 show respectively in partial cross section, a furniturepanel before and after the pressing process, and

Fig. 3 is an end view in section corresponding to Fig. 1. y

A lower panel side 2 is laid on the fioor of a press mould l capable ofbeing heated if desired and is of any desired form, the upper face ofwhich (Fig. 1), at least at the points at which ledges l1, H] arepositioned, is provided with a film of glue or synthetic resin. Themarginal ledge, or edge strip ll lying against the side wall of themould i has a cross section of trapezoidal shape. Its upper face isinterrupted by a deep longitudinal groove l9 and from the mouth of thelongitudinal groove I9 is inclined away from the mould towards the innerspace 22. Further ledges [0 are joined transversely to the marginalledges I! at predetermined points, the cross section of which ledges canbe seen from Fig. 3 and which are provided with bores I2 for thereception of dowels l4. Triangular headings 25 of small cross sectionare laid transversely above the ledges Ill. Into the longitudinalgrooves l9 of the marginal ledges l1 glued on to panel side 2 isinserted (Fig. 1) the lower longitudinal edge of a key strip 2| on theupper longitudinal edge ,of which a second marginal ledge I8 is stuckwith a corresponding longitudinal groove 20. In addition, upper ledgesII are fixed on the upper In this manner as is shown in Fig. 1 withoutthe upper panel side [5 being laid on-packing or filling material of anydesired kind, for example, slag wool, is charged into the space 22 sothat the inclined edges 23 of the marginal ledges I! and the key strip2| form the lateral limitation of the space 22. If

new the upper panel side I5 has spread on its lower face a film of glueor synthetic resin and is pressed downwardly by means of acorrespondingly wide press die 24 until (Fig. 2) the surfaces, which areturned towards one another and provided with a glue film at the marginalledges l1, 53, make contact with one another and the thin triangularheadings 25 are partially crushed there is achieved a good and permanentconnection of the panel sides or surfaces 2, IS with one another abovethe marginal ledges l8 and with the packing substance pressed togetherin a narrow space 22a. Moreover, the ledges [0, II with their dowels Mand the triangular beadings 25 glued thereto then give the panel itselfa rigid support if packing materials are employed which are notcompounded with a binding means.

If the filling materials are mixed with a binding agent it is possibleto dispense with the ledges II II and their dowels M, as the fillingmaterials containing the binding agent enable a sufficiently firm andrigid connection with the panel sides or surfaces. In some cases thecorresponding upper half 8 to the ledge IT can be dispensed with, if onemakes the lower ledge ll so thick that at the end of the pressingoperation (pressing stroke) the lower side of the panel I5 comes to reston the upper side of the ledge H, whereby obviously also the key strip2! must be pressed completely into the correspondingly deep slot IQ ofthe lower ledge I I. In this case also the inner inclined edge 23 of theglueing ledge ll forms together with the key strip 2! which projectsover and above the slot Hi the inner limit of the space '22, when it issupplied with the incompressed filling material before the upper coverplate has been fitted. The inclined edge 23 has hereby a special purposebecause all the filling material banked up near the key strip 21 canslide to the inside on an inclined path on pressing and not disturb thepressing process. As soon as the glue or synthetic material has hardenedin the pressing position (Fig. 2), the upper die 24 of the press can bepulled back and the complete panel can be taken out of the mould. Thepanel is distinguished by stability and easy workability and is cheap inproduction, as the glueing edges around the panel can be fitted by thesimplest process in a single working step. Naturally, it is notnecessary to provide all sides of the panel with ledges if one, as it isthe case with numerous furniture panels, for instance only needs glueingledges on two or three faces. The width of the ledges IT, 18 is sochosen that the glueing edge of the ledge is wide enough so that ifnecessary it can be subsequently further machined. The bore holes I2,[3, and the dowels 14 are preferably provided with glue in order toachieve a firm connection of the parts with one another. Basically it isall the same whether the cover plates 2, 15 or the ledges I1, l8, l0, Hare spread with glue. The ledges H or [8 may be produced as integralframes.

What I claim is:

l. A process for the manufacture of a panel member having fillermaterial sandwiched between the panel faces and bounded by the paneledges, said process comprising the steps of spreading adhesive onto theinner surface of a panel. facing member and adjacent the edges thereof,then placing panel edge strips along said edges and against saidadhesive-covered surface, each of said panel edge strips having aninclined face facing toward the interior of the panel member and alsohaving a groove extending lengthwise of said edge strip substantiallyperpendicular to said inner surface having adhesive thereon, thenplacing a key strip at the mouth of each of said grooves, each key stripand associated panel edge strip together providing a wall along the edgeof the panel facing member with which they are associated, then placingcompressible filler material in the space bounded by said walls,spreading adhesive adjacent the edges of a second panel facing member,then placing the surface of said second panel facing member having theadhesive thereon against each key strip, and then pressing said secondpanel facing member toward the firstmentioned panel facing member tocompress the filler material therebetween and simultaneously force eachkey strip into the groove of the panel edge strip with which said keystrip is associated, the inclined faces on said panel edge strips urgingthe filler material toward the interior of the panel member.

2. A process for the manufacture of a panel member having fillermaterial sandwiched between the panel faces and bounded by the paneledges, said process comprising the steps of spreading adhesive ontoopposite surfaces of each of a plurality of panel edge strips, placingan adhesive-covered surface of each of said panel edge strips againstthe inner surface of a panel facing member and adjacent the edgesthereoof, each of said panel edge strips having an inclined face facingtoward the interior of the panel member and also having a grooveextending lengthwise of said edge strip substantially perpendicular tosaid inner surface of the panel facing member, then placing a key stripat the mouth of each of said grooves, each key strip and associatedpanel edge strip together providing a wall along the edge of the panelfacing member with which they are associated, then placing compressiblefiller material in the space bounded by said wall, then placing thesurface of a second panel facing member against each key strip adjacentthe edges of said second panel facing member, and then pressing saidsecond panel facing member toward the first-mentioned panel facingmember to compress the filler material therebetween and simultaneouslyforce each key strip into the groove of the panel edge strip with whichsaid key strip is associated, the inclined faces of said panel edgestrips urging the filler material toward the interior of the panelmember.

3. A process for the manufacture of a panel member having fillermaterial sandwiched between a pair of panel faces and bounded by thepanel edges, said process comprising the steps of spreading adhesiveonto the inner surface of each panel facing member adjacent the edgesthereof, then placing panel edge strips along said edges and against theadhesive-covered surfaces of each of said pair of panel facing members,each of said panel edge strips having an inclined face facing toward thinterior of the panel member and also having a groove extendinglengthwise thereof substantially perpendicular to the adhesive-coveredinner surface with which said edge is associated, the respective edgestrips and grooves associated with each panel facing member beingsimilarly disposed whereby they may be positioned in registry with andopposite each other, then placing a key strip at the mouth of eachgroove in each edge strip associated with one of said panel facingmembers, each key strip and associated panel edge strip togetherproviding a wall along the edge of the panel facing member with whichthey are associated, then placing compressible filler material in thespace bounded by said walls, then positioning the other panel facingmember in registry with an opposite the panel facing member having thekey strips associated therewith whereby said key strips may enter thegrooves in the edge strips associated with said second panel facingmember, and then pressing said second panel facing member toward thefirst-mentioned panel facing member to compress the filler materialtherebetween and simultaneouly force each key strip into the panel edgegroove associated therewith to provide a composite panel edge structure,the inclined faces on said panel edge strips urging the filler materialtoward the interior of the panel member.

4. A process according to claim 3 in which reinforcing strips are placedacross the inner surface of the first-mentioned panel facing memberprior to the adding of the compressible filler material, each of saidreinforcing strips having a plurality of openings therein, placingdowels in the mouths of said openings, and simultaneously forcing saiddowels into the openings in said reinforcing strips when the secondpanel facing member is pressed toward the first-mentioned panel facingmember.

5. In a process for the manufacture of a panel member having fillermaterial sandwiched between the panel faces and bounded by the paneledges, the method of forming a panel edge which comprises the steps ofspreading adhesive onto the inner surface of the panel facing memberadjacent an edge thereof, placing a panel edge strip along said edg andagainst said adhesivecovered surface, said edge strip having an inclinedfa-ce facing toward the interior of the panel member and also having agroove extending lengthwise of the edg strip substantially perpendicularto said adhesive-covered inner surface, then placing a key strip at themouth of said groove, spreading adhesive onto the inner surface of asecond panel facing member adjacent an edge thereof, then placing theadhesivecovered surface of said second panel facing member against saidkey strip, said respective edges of said panel facing members being ofsimilar size and shape whereby they may be positioned in substantialregistry, and then pressing said second panel facing member toward thefirst panel facing member to force said key strip into the panel edgestrip groove until said strip is fully seated in said groove and theadhesivecovered inner surface of said second panel facing member ispressed into contact with said edge strip.

6. In a process for the manufacture of a panel member having fillermaterial sandwiched between the panel faces and bounded by the paneledges, the method of forming a panel edge which comprises the steps ofspreading adhesive onto opposite surfaces of an edge strip, placing anadhesive-covered surface of said edge strip against the inner surface ofa first panel facing member and adjacent an edge thereof, said edgestrip having an inclined face facing toward the interior of the panelmember and also having a groove extending lengthwise of said edge stripsubstantially perpendicular to said inner surface of the panel facingmember, then placing a key strip at the mouth of said groove, thenplacing the inner surface of a second panel facing member against saidkey strip adjacent an edge of said second panel facing member, saidrespective edges of said panel facing members being of similar size andshape whereby they may be positioned in substantial registry, and thenpressing said second panel facing member toward the first panel facingmember to force said key strip into the panel edge strip groove untilsaid strip is fully seated in said groove and said second panel facingmember is pressed into contact with an adhesive-covered surface of saidedge strip.

7. In a process for the manufacture of a panel member having fillermaterial sandwiched between a pair of panel faces and bounded by thepanel edges, the method of forming a panel edge which comprises thesteps of spreading adhesive onto th inner surface of each of said panelfacing members adjacent an edge of each of said members, said edgesbeing of similar size and shape whereby they may be positioned insubstantial registry, then placing an edge strip against eachadhesive-covered surface and along each panel facing member edge, eachof said panel edge strips having an inclined face facing toward theinterior of the panel member and also having a groove extendinglengthwise of said edge strip substantially perpendicular to theadhesive-covered surface against which said edge strip is placed, saidrespective edge strips and grooves associated with said panel facingmembers being similarly disposed whereby they may be positioned inregistry with and opposite each other, then placing a strip at the mouthof the groove in the edge strip associated with one of said panel facingmembers, then positioning the other panel facing member opposite thefirstmentioned panel facing member so that the key strip may enter thegroove in the edge strip associated with said second panel facingmember, and then pressing said second panel facing member toward thefirst-mentioned panel facing member to force said key strip into seatedposition in each of said grooves and bring said edge strips in contactwith each other to provide a composite panel edge strip.

WERNER PRASE.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,863,800 Loetscher June 21, 1932 1,885,364 Lewis Nov. 1, 19322,073,896 Loetscher Mar. 16, 1937 2,140,210 Schenk Dec. 13, 19382,157,622 Neesen et al May 9, 1939 2,385,352 Davis Sept. 25, 1945

